Your Query returns 26 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
NMDAR1NM_00816910090NR1    Nmdar    GluRdelta1    Grin1    138249
NMDAR1NM_0008329606NR1    NMDA1    GRIN1    138249
NMDAR1NM_0073279606NR1    NMDA1    GRIN1    138249
NMDAR1NM_0215699606NR1    NMDA1    GRIN1    138249
NMDAR1AY15751510116Grin1   
NMDAR1BC03915710090NR1    GluRdelta1    Grin1    138249
Nmdar1AY0705777227
Nmdar1AY3311837460
NMDAR1L0822810116
NMDAR1U0826110116
NMDAR1U0826210116
NMDAR1U0826310116
NMDAR1U0826410116
NMDAR1U0826510116
NMDAR1U0826610116
NMDAR1U0826710116
NMDAR1U0826810116
NMDAR1X6325510116
NMDAR1AH00405810118
NMDAR1S4639310118
NMDAR1S4639410118
NMDAR1AF14605895347
Nmdar1AE0036027227
NMDAR1AB04275659729
Nmdar1NM_1690597227NRI    nmr    DrNR1    Nmdar    CG2902    DNmdar    DMNMDAR1    DNMDAR-I   
Nmdar1NT_0337777227NRI    nmr    DrNR1    Nmdar    CG2902    DNmdar    DMNMDAR1    DNMDAR-I   

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* OMIM link based on symbol match for human and mouse.

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Text2Knowledge ... Yong Huang 2002